ELM320(2003) 查看數據表（PDF） - Elm Electronics

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ELM320
(Rev.:2003)

OBD (PWM) to RS232 Interpreter

Elm Electronics 

OBD

Interface

16

(Battery

Positive)

5

(Signal

Ground)

2

(Bus +)

10

(Bus -)

+5V

2.7KΩ

4.7KΩ

ELM320

78L05

0.47µF

+5V

+5V

750Ω

‘Power On’

LED

4.7KΩ

Notes: - NPN transistors are

2N3904 or similar

- PNP transistors are

2N3906 or similar

- Diodes are 1N4148,

1N4001, etc.

4.7KΩ

10KΩ

+5V

0.01µF

2.7KΩ

+5V

27pF

1

3.58MHz

2

3

27pF

4

+5V

10KΩ

8

+5V

7

6

5

10KΩ

RS232

Interface

3 (RxD)

47KΩ

4.7KΩ

0.1µF

7 (SG)

4.7KΩ

100KΩ

2 (TxD)

ELM320DSC

Figure 4. Typical OBD to RS232 Interface

Elm Electronics – Circuits for the Hobbyist

< http://www.elmelectronics.com/ >

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